There is only cpuoverclock.py to change the cpu freq. It is not enough and caused screen flicker.

1. As yonggun's cpufreq kernel, it support cpufreq interface and use cpufreqd to change cpu freq according to cpu usuage.

2. PXA support speedstep. It means the cpu freq can be changed only step by step. It may cause hardware problem if we change cpu freq too much. The problem has been found when I developed mb-applet-powerctrl.

3. Lower cpu freq has no problem when suspend or resume in pdaxrom. But in eabi, it cause white screen.